An at-risk 74-year-old man who walked away from a residential care facility in Redwood City Thursday morning was found nearby in the city of Atherton, according to police. Redwood City police initiated a search and issued a Nixle alert with McJimsey’s photograph, according to police Lt. Sean Hart. “An alert citizen saw his picture on the Nixle alert and notified us,” Hart said. McJimsey was considered an at-risk missing person because he has mild dementia, according to police.